package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import com.github.pagehelper.Page;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * @Author：chén jiā jùn
 * @Create：2023年11月16日16:04
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {


	@Autowired
	private SetmealDishMapper setmealDishMapper;
	@Autowired
	private DishMapper dishMapper;
	@Autowired
	private DishFlavorMapper dishFlavorMapper;
	/**
	 * 新增菜品和对应的口味
	 */
	@Transactional
	@Override
	public void saveWithFlavor(DishDTO dishDTO) {
			Dish dish = new Dish();
			BeanUtils.copyProperties(dishDTO, dish);
			//向菜品表插入1条数据   我们在xml中设置了 keyProperty="id"  我们就能得到数据库设置的id了
			dishMapper.insert(dish);//后绪步骤实现

			//获取insert语句生成的主键值
			Long dishId = dish.getId();

			List<DishFlavor> flavors = dishDTO.getFlavors();
			if (flavors != null && !flavors.isEmpty()) {
				flavors.forEach(dishFlavor -> {
					dishFlavor.setDishId(dishId);
				});
				//向口味表插入n条数据
				dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
			}
	}


	/**
	 * 菜品分页查询
	 *
	 * @param dishPageQueryDTO
	 * @return
	 */
	@Override
	public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
//		使用mybatis提供的分页工具 ：PageHelper 传入了当前页码 和 每页显示的条数
		PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
		Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);//后绪步骤实现
		return new PageResult(page.getTotal(), page.getResult());
	}


	/**
	 * 菜品批量删除
	 *
	 * @param ids
	 */
	@Transactional//事务
	@Override
	public void deleteBatch(List<Long> ids) {
		//判断当前菜品是否能够删除---是否存在起售中的菜品？？
		for (Long id : ids) {
			Dish dish = dishMapper.getById(id);//后绪步骤实现
			if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
				//当前菜品处于起售中，不能删除
				throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
			}
		}

		//判断当前菜品是否能够删除---是否被套餐关联了？？
		List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
		if (setmealIds != null && !setmealIds.isEmpty()) {
			//当前菜品被套餐关联了，不能删除
			throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
		}

		//删除菜品表中的菜品数据
		for (Long id : ids) {
			dishMapper.deleteById(id);//后绪步骤实现
			//删除菜品关联的口味数据
			dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
		}
	}


	/**
	 * 根据id查询菜品和对应的口味数据
	 *
	 * @param id
	 * @return
	 */
	@Override
	public DishVO getByIdWithFlavor(Long id) {
		//根据id查询菜品数据
		Dish dish = dishMapper.getById(id);
		//根据菜品id查询口味数据
		List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);//后绪步骤实现
		//将查询到的数据封装到VO
		DishVO dishVO = new DishVO();
		BeanUtils.copyProperties(dish, dishVO);
		dishVO.setFlavors(dishFlavors);

		return dishVO;
	}


	/**
	 * 根据id修改菜品基本信息和对应的口味信息
	 *
	 * @param dishDTO
	 */
	@Override
	public void updateWithFlavor(DishDTO dishDTO) {
		Dish dish = new Dish();
		BeanUtils.copyProperties(dishDTO, dish);

		//修改菜品表基本信息
		dishMapper.update(dish);

		//删除原有的口味数据
		dishFlavorMapper.deleteByDishId(dishDTO.getId());

		//重新插入口味数据
		List<DishFlavor> flavors = dishDTO.getFlavors();
		if (flavors != null && !flavors.isEmpty()) {
			flavors.forEach(dishFlavor -> {
				dishFlavor.setDishId(dishDTO.getId());
			});
			//向口味表插入n条数据
			dishFlavorMapper.insertBatch(flavors);
		}
	}

	/**
	 * 修改菜品状态的方法
	 * @param status
	 * @param id
	 */
	@Override
	public void updateStatus(Integer status, Long id) {
		Dish dish = Dish.builder().status(status).id(id).build();
		//修改菜品表基本信息
		dishMapper.update(dish);
	}

	/**
	 * 条件查询菜品和口味
	 * @param dish
	 * @return
	 */
	public List<DishVO> listWithFlavor(Dish dish) {
		List<Dish> dishList = dishMapper.list(dish);
		List<DishVO> dishVOList = new ArrayList<>();
		for (Dish d : dishList) {
			DishVO dishVO = new DishVO();
			BeanUtils.copyProperties(d,dishVO);
			//根据菜品id查询对应的口味
			List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());
			dishVO.setFlavors(flavors);
			dishVOList.add(dishVO);
		}

		return dishVOList;
	}
}
